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Ashworth MA260 Exam 1 Answers / Statistical Analysis I

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MA260 Statistical Analysis Online Exam 1 Answers (Ashworth College)

Question 1 of 20

5.0/ 5.0 Points

Temperatures in degrees Fahrenheit of the ocean at various depths:

 

A. Ratio    B. Interval     C. Ordinal     D. Nominal

 

Question 2 of 20

5.0/ 5.0 Points

Compared with a stopwatch that gives readings as --. - seconds, a stopwatch that gives readings as --. - - seconds is:

 

A. more accurate, but not necessarily more precise.

B. more precise and more accurate.

C. not necessarily more precise or more accurate.

D. more precise, but not necessarily more accurate.

 

Question 3 of 20

5.0/ 5.0 Points

Which is the best fertilizer for Mr. Jimenez’ backyard grass? Select the type of study most appropriate to the question.

 

A. Experimental             B. Experimental blinded

C. Case-controlled observational            D. Observational

 

 

 

 

 

Question 4 of 20

5.0/ 5.0 Points

A U.S. government report stated that, “With bank interest rates around 
1.0%, 8% of wage earners believe it worthwhile to keep money in a 
savings account. However, at 3.0% interest, 36% of wage earners believe 
it worthwhile to keep money in a savings account. The margin of error 
for both studies is 4 percentage points.”. A proper conclusion from the 
studies is that:

 

A. increasing the interest rate from 1% to 3% will increase the number of 
persons saving money in a savings account.

B. increasing the interest rate may well have no effect on the number of 
persons saving money in a savings account.

C. increasing the interest rate will increase the number of persons saving 
money in a savings account.

D. the interest rate difference between 1% and 3% may well have no effect 
on the number of persons saving money in a savings account.

 

Question 5 of 20

5.0/ 5.0 Points

One month before a recall election, a poll of 500 Wisconsin voters showed that 46% planned to vote for the Democratic challenger Tom Barrett and 45% planned to vote for Republican Governor Scott Walker. Undecided voters constituted another 9%. The margin of error was 5 percentage points. What conclusion can you draw from this poll?

 

A. Barrett will win the election.   B. Walker can’t get over 50% of the votes.

C. The race is too close to call.   D. No one will win.

 

 

 

 

 

Question 6 of 20

5.0/ 5.0 Points

The results of a poll are stated as follows: “Based on a survey of 156 randomly selected students, 90% of the student body of 2870 students agree that no student should have to take final exams in two consecutive exam periods”. If 2578 students actually agree, then what is the absolute error in the reported result?

 

A. 5 students       B. 287 students        C. 0.17%     D. 292 students

 

Question 7 of 20

5.0/ 5.0 Points

A nutritionist wants to conduct a study to validate the efficacy of an herb as an aid in weight loss. She randomly assigns half of a group of overweight persons to a treatment group who are given the herb with instructions for its use and a planned diet for six weeks. The other half of the group is given parsley with the same instructions and same diet. A nurse at the nutrition center weighs each subject on Friday of each week. Select the potential source of confounding.

 

A. Placebo effect        B. Experimenter effect

C. Method of assignment to treatment and control groups

D. The study is essentially free of potential confounding.

 

Question 8 of 20

5.0/ 5.0 Points

The father of a junior high school student wants to determine the most popular book among junior high students. Select the sample with the least potential bias.

 

A. A randomly selected group of 10 book sellers

B. A randomly selected group of 30 junior high students

C. A randomly selected group of 30 junior high students leaving the public library

D. The group of 30 junior high students attending the birthday party of the
researcher’s child

 

Question 9 of 20

5.0/ 5.0 Points

A poll was taken of a random sample of 1189 college students. Of these 
students, 789 reported that they had a drinking binge (more than 10 
drinks in an evening) in the past month. Select the most believable conclusion.

 

A. About 66.358% of college students indulged in binge drinking last month.

B. Of the 23,456,321 college students in the country, 15,565,212 indulged 
in binge drinking last month.

C. About 65% of college students indulge in binge drinking.

D. About 65% of college students indulged in binge drinking in the past month.

 

Question 10 of 20

5.0/ 5.0 Points

The size of an e-mail file is stated as 210 kB, but the file size is actually 220.5 kB. What is the absolute error?

 

A. 5%         B. 10%          C. 10.5 kB           D. -10.5 kB

 

Question 11 of 20

5.0/ 5.0 Points

A college student who does laundry infrequently wants to determine the effect of bluing on what should be white clothes. Select the sample most representative of the population.

 

A. Reports of two friends, one of whom was given bluing

B. The reports of an internet chatroom on laundry techniques

C. Two loads of personal wash, one with, one without bluing

D. Two loads of wash, one personal, one of a friend, the bluing assigned by
a coin flip

 

 

Question 12 of 20

5.0/ 5.0 Points

A sample consists of every 49th student from a group of 496 students. Identify the type of sampling used.

 

A. Systematic        B. Cluster          C. Convenience       D. Random

 

Question 13 of 20

5.0/ 5.0 Points

To avoid working late, a quality control analyst simply inspects the first 100 items produced in a day. Identify the type of sampling used.

 

A. Stratified          B. Cluster           C. Convenience            D. Random

 

Question 14 of 20

5.0/ 5.0 Points

Convert 5/16 to a percent.

 

A. 31.25%         B. 0.3125%          C. 3.125%          D. 0.03125%

 

Question 15 of 20

5.0/ 5.0 Points

Soft drink sizes: small, medium, large:

 

A. Qualitative, nominal           B. Quantitative, ordinal

C. Quantitative, ordinal, discrete              D. Qualitative, ordinal

 

 

Question 16 of 20

5.0/ 5.0 Points

A homeowner put a brand-name fertilizer/weed killer on half of his lawn and a generic fertilizer/weed killer on the other half. After three weeks, the generic side had 1 weed per square meter, the other side 1.7 weeds per square meter. The generic side required two mowings in the 3 weeks, the brand-name side one. The homeowner concluded that the generic was superior to the brand-name. Determine which evaluation guideline applies best in questioning the results of the described study.

 

A. Consider possible confounding variables.

B. Consider the sample. C. Consider the type of study. D. Consider the source.

 

Question 17 of 20

5.0/ 5.0 Points

Convert 13% to decimal form.

 

A. 0.013          B. 0.13            C. 1.3            D. 13

 

Question 18 of 20

0.0/ 5.0 Points NOTES: MY 1ST CHOICE WAS D BUT THEN HESITATED AND WHEN WITH A.

Suppose that the cost of a statistics text was $50 in 1985 and is $100 in 2000. What is the ‘Statistics Text Index’ number, rounded to the nearest tenth, for the 2000 edition with the 1985 price as the reference value?

 

A. 20.0        B. 200.0          C. 50.0            D. 2.0

 

 

 

 

 

 

 

Question 19 of 20

5.0/ 5.0 Points

Data has been collected from a representative sample of a well-defined population to answer the question: “How much money does the average senior male at Normal Community High School have in his pockets at the end of the school day on Friday?” The next step in the study is to:

 

A. determine the margin of error. B. summarize the data with a sample statistic.

C. use the collected data to make inferences about the population.

D. summarize the data with a sample parameter.

 

Question 20 of 20

5.0/ 5.0 Points

Humanities majors spend an average of $115 per course on books. 
Mathematics majors spend an average of $70 per course on books. What is 
the percent difference between the two amounts relative to the amount 
for mathematics majors (round to the nearest percent)?

 

A. 64%       B. 39%        C. 50%          D. 42%

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